Refi Tri Anika, Nabila Febriyana, Siti Maisyaroh, Maria Yovita R Pandin. Analysis of the Effect of Stock Portfolio Diversification with the Markowitz Method Approach to Portfolio Risk and Return on Idxbumn20 Index Stocks. Ijemr [Internet]. 2024 Apr. 30 [cited 2025 Apr. 19];3(1):26-40. Available from: https://ijemr.asia/index.php/ijemr/article/view/154